There is no fixed interval. Auditing on a calendar produces reports nobody acts on; auditing when something changes produces findings that matter. The useful answer is driven by events and site size rather than by months elapsed.
A reasonable baseline
- Small, stable sites: annually is usually enough.
- Medium sites publishing regularly: every six to twelve months.
- Large or ecommerce sites: quarterly, with continuous monitoring in between.
- Sites under active development: monitoring continuously, with a full audit after significant releases.
Size and rate of change drive this. A ten-page site that never changes does not develop new technical problems; a store adding products daily does.
Audit when these happen, regardless of timing
- Before a migration or redesign, which is the highest-value moment. See pre-migration audit.
- After one, to verify what shipped. See post-migration audit.
- After a platform or theme change.
- When traffic drops unexplained — though that is a recovery, not an audit. See recovery vs audit.
- When pages stop being indexed.
- Before committing to an ongoing programme, so content is not published onto a broken foundation.
- After a period of unmanaged growth, where sections were added without structural oversight.
Monitoring is not auditing
These are different activities and both are worth having.
- Monitoring is continuous and narrow — indexation counts, crawl errors, Core Web Vitals, uptime. It tells you something changed.
- Auditing is periodic and broad. It tells you what is structurally limiting the site.
Good monitoring reduces how often you need a full audit, because problems surface as they appear rather than accumulating until someone looks.
The case against auditing too often
Audits produce more findings than anyone implements. Running another before the last one has been acted on generates a backlog and the impression of activity without change.
If your previous audit is not fully implemented, implementing it beats commissioning a new one. See SEO roadmap after an audit and why SEO audits fail.
Frequently asked questions
Is an annual audit enough?
For a stable site with monitoring in place, usually. For one under active development, no.
Can I audit my own site?
You can run the tools. The difficulty is prioritisation and diagnosis rather than detection. See free vs professional audits.
What if nothing has changed since the last one?
Then you probably do not need another. The web around you changes, which is what monitoring is for.
How long does one take?
Typically one to three weeks depending on site size and how much diagnosis the findings require.
Consulting CTA
To discuss the right cadence for your site, book an SEO consultation.